Solar power typically refers to the production of electricity from light given off by the sun. The most common instance of this is the use of photovoltaic cells in solar panels, which have been employed on the small scale (e.g. solar powered calculators) and large scale (e.g. solar power plants, orbiting artificial satellites).
Solar power is a renewable energy source, in contrast with fossil fuels. Solar power production via photovoltaic cells typically produces a less efficient conversion of energy into electricity compared to power production from the burning of fossil fuels, but with the abundance of solar rations available to Earth, this limited efficiency is normally inconsequential.
The main drawback to using solar power as a principle energy source is the inability to provide baseload power throughout the day and night: the sun cannot be guaranteed to shine every day, power is still in demand after the setting of the sun, and some areas of the world do not receive enough consistent sunlight to rely on solar power as a main energy source. Thus, solar power will, at least in the foreseeable future, not become a principle part of the world's energy production but may still be very useful in supplementing power demands in some parts of the world. Employment of small solar power arrays in areas that are rarely overcast (e.g. the American southwest) may allow some businesses to cheaply produce products and chemicals that require large electrical demand (e.g. the production of extremely pure hydrogen and oxygen from the electrolysis of water).
Grid parity refers to the point where power provided by solar panels (photovoltaic solar) is at the same or lower price of conventional power sources such as coal, natural gas or nuclear. The price per watt of installed solar has been steadily falling while the price of other energy sources including wind power has been steadily rising. A historic crossover with nuclear power occurred in 2010. In regions with adequate sun exposure electricity can now be produced at a lower cost per kWh with PV solar than with nuclear power. The price for a DIY residential grid-tie solar system can be as low as $2.50/w (2011), before subsidies or tax credits. At this price the system would pay for itself in ~12 years, many utilities offer incentives that can lower payback to <4 years. Most systems carry a 25-30 year warranty. Due to the fact that most solar power is produced when electric demand is highest, between 3pm - 7pm many utilities actually benefit from paying their customers to install solar panels since most districts do not charge peak rates. It can cost a major utility as much as $.50/kwh during peak demand while solar production credits are usually ~$.20/kwh. Roof-top PV can be extremely cost-effective since no land needs to be purchased.
Conventional sources of power generation are concentrated in power plants that range from 100MW to 1000MW. Distributed Generation is the grid-tied production of electricity from smaller generators typically less than 100 kW. Solar Power is an ideal source of energy for distributed generation. Most residential rooftops are capable of supporting at least 3 kW of solar panels while many commercial warehouses can support several MW of solar PV. In sunny regions of the US this is adequate to provide >50% of the electricity requirements for the average US household. One major advantage to distributed generation is that it is consumed very close to where it is produced, this decreases the stress on America's electric grid which is already operating near capacity. Germany is an example of how effective distributed generation can be adding 7 GW of solar power in 2010 alone, this is more electricity than is produced by a nuclear power plant. Solar power often provides >10% of electricity in Germany during the day and doubled in capacity from 2009 to 2010.
World Wide Solar PV Increase
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In 2012 in the United States, wind and solar photovoltaics (PV) were two of the fastestgro wing electric generation technologies. In 2012, cumulative installed wind capacity increased by nearly 28% and cumulative installed solar photovoltaic capacity grew more than 83% from the previous year. Solar electricity generating capacity grew by a factor of over 21 between 2000 and 2012 and currently accounts for 0.3% of annual U.S. electricity generation. Countries with extensive solar policies—such as Germany, Spain, and Italy— lead the world in solar photovoltaic (PV) deployment. Similarly, U.S. states with extensive solar incentives lead the United States in both cumulative and annual installations in 2012 (California, Arizona, New Jersey, Nevada, and Colorado). U.S. manufacturers currently have a small share of the worldwide PV market. Asian—particularly Chinese—manufacturers lead the market with nearly 85% of the global photovoltaic module production. 30 MW of new concentrating solar power (CSP) capacity came online in the United States in 2012. Approximately 1.6 GW of CSP projects are currently under construction in the United States and are projected to come online in 2013 and 2014; 900 MW are estimated to come online in 2013 alone. 
Global warming claims
Liberals often point to solar power as a way to "solve" global warming. This has several problems. Other than the fact that the claim of global warming is dubious, to say the least, solar power is not very efficient, giving much less energy than oil. Many liberals have tried to force solar power onto many areas, despite the fact that it would be very costly and would be much more inefficient than oil, for example.